OPPOSED-PISTON TYPE ENGINE

Provided is an opposed-piston engine capable of minimizing a mechanism for transmitting rotational power of a crankshaft to a valve. An opposed-piston engine (1) includes a cylinder (4), a first piston (8A) provided in the cylinder, a second piston (8B) provided in the cylinder and opposed to the first piston, a first crankshaft (9A) which rotates as the first piston rotates, a second crankshaft (9B) which rotates as the second piston rotates, a valve (13) which performs an operation to intake or exhaust air into or from the cylinder, and a power transmission mechanism (20) which transmits the rotational power of the first crankshaft to the valve so as to cause the valve to perform the operation. The first crankshaft and the second crankshaft are juxtaposed with a space therebetween in an alignment direction in which the first piston and the second piston are aligned, and the power transmission mechanism extends in the alignment direction to a position corresponding to the first crankshaft and to a position corresponding to the second crankshaft across the space therebetween.